/*

 * jmemnobs.c

 *

 * Copyright (C) 1992-1996, Thomas G. Lane.

 * This file is part of the Independent JPEG Group's software.

 * For conditions of distribution and use, see the accompanying README file.

 *

 * This file provides a really simple implementation of the system-

 * dependent portion of the JPEG memory manager.  This implementation

 * assumes that no backing-store files are needed: all required space

 * can be obtained from malloc().

 * This is very portable in the sense that it'll compile on almost anything,

 * but you'd better have lots of main memory (or virtual memory) if you want

 * to process big images.

 * Note that the max_memory_to_use option is ignored by this implementation.

 */

#define JPEG_INTERNALS

#include "jinclude.h"

#include "jpeglib.h"

#include "jmemsys.h"                /* import the system-dependent declarations */

#ifndef HAVE_STDLIB_H                /* <stdlib.h> should declare malloc(),free() */

extern void * malloc JPP((size_t size));

extern void free JPP((void *ptr));

#endif

/*

 * Memory allocation and freeing are controlled by the regular library

 * routines malloc() and free().

 */

GLOBAL(void *)

jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)

{

  return (void *) malloc(sizeofobject);

}

GLOBAL(void)

jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)

{

  free(object);

}

/*

 * "Large" objects are treated the same as "small" ones.

 * NB: although we include FAR keywords in the routine declarations,

 * this file won't actually work in 80x86 small/medium model; at least,

 * you probably won't be able to process useful-size images in only 64KB.

 */

GLOBAL(void FAR *)

jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)

{

  return (void FAR *) malloc(sizeofobject);

}

GLOBAL(void)

jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)

{

  free(object);

}

/*

 * This routine computes the total memory space available for allocation.

 * Here we always say, "we got all you want bud!"

 */

GLOBAL(long)

jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,

                    long max_bytes_needed, long already_allocated)

{

  return max_bytes_needed;

}

/*

 * Backing store (temporary file) management.

 * Since jpeg_mem_available always promised the moon,

 * this should never be called and we can just error out.

 */

GLOBAL(void)

jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,

                         long total_bytes_needed)

{

  ERREXIT(cinfo, JERR_NO_BACKING_STORE);

}

/*

 * These routines take care of any system-dependent initialization and

 * cleanup required.  Here, there isn't any.

 */

GLOBAL(long)

jpeg_mem_init (j_common_ptr cinfo)

{

  return 0;                        /* just set max_memory_to_use to 0 */

}

GLOBAL(void)

jpeg_mem_term (j_common_ptr cinfo)

{

  /* no work */

}